In Austria, 17 cases have so far been recorded in several regions. They involve nails, metal pins or a staple.
Cases have been reported in Austria, Germany, Hungary and Poland. The objects found include nails, metal pins, a staple and a needle.
The reports concern sharp metal objects hidden in candies. No further details on the identity of the perpetrators have been made public in the available information.
In Poland, police opened an investigation after a similar discovery made by four children, in Pomerania, in the north of the country.
In Germany, authorities also reported this week several cases of small metal objects found in Halloween treats.
The incidents involve treats collected by children for Halloween. Authorities in several countries have opened investigations.
A 10-year-old girl was slightly injured in the mouth after biting into a chocolate that contained a needle, according to the APA news agency. Austrian police said candies had been tampered with using sharp metal objects in a comparable modus operandi.